Which Supreme Court case struck down the Gun-Free School Zones Act of 1990, signaling limits to federal authority?

• A. McCulloch v. Maryland
• B. Marbury v. Madison
• C. Dred Scott v. Sandford
• D. United States v. Lopez

Answer: (D)

The main concept here is the limits of federal power under the Commerce Clause and how some activities are better addressed by states. United States v. Lopez held that the Gun-Free School Zones Act of 1990 went beyond what Congress can regulate under commerce power. The Court said simply carrying a firearm in a school zone is not an economic activity that substantially affects interstate commerce, so it isn’t within Congress’s reach. The decision reinforces that federal authority has boundaries and that not all local or intrastate issues fall under federal regulation; such matters often fall to states or localities.

This fits with the idea that Congress can regulate channels and instrumentalities of interstate commerce or activities that substantially affect it, but a possession of a gun in a school zone doesn’t neatly fit those categories. That’s why this ruling is cited as signaling limits to federal authority.

For context, the other cases involve different constitutional questions: McCulloch v. Maryland deals with federal supremacy and implied powers under the Necessary and Proper Clause; Marbury v. Madison establishes judicial review; Dred Scott v. Sandford addresses citizenship and slavery. None of these directly illustrate the specific limit on Congress’s commerce power that Lopez does.